Audi A5 2009–2013 — technical service bulletin
Bulletin 148920330016 · NHTSA communication 10216626 · issued Aug 19, 2014
Technical service bulletin
communication type
Power Train
component
2009–2013
model years
18
vehicle entries
Official summary
Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over time, causing a restriction.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.